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Rolair PMP11K8GR aluminum and cast iron cylinder replacement pump with 10 1/8 inch flywheel

Rolair

Rolair PMP11K8GR Cylinder Replacement Pump

SKU CH-74W7-M09SR

Single-stage cast-iron cylinder pump rated 1.5 hp with 145 psi maximum pressure and 2.66 to 3.72 cfm free air delivery

  • Direct-drive simplicity with a single-stage design
  • 5 hp maximum output for strong airflow
  • 66 or 3.72 cfm at 145 psi delivery
  • Durable aluminum and cast-iron construction
  • Stainless-steel reed valves resist wear

Replacement Pump for 1.5 hp Compressors

This cylinder replacement pump restores a Rolair compressor to its original 1.5 hp output. It fits units that run at 1,000 RPM with a single-stage, splash-lubricated design. The aluminium and cast-iron construction includes a 10 1/8 in flywheel and a single A-section groove. Builders needing a different stage count or rotation direction should look elsewhere.

Thermals Noise and Power Draw

Splash lubrication keeps internal friction low during continuous operation at 145 psi maximum pressure. The single cylinder moves 2.66 to 3.72 cfm of free air, so the motor runs at its rated 1.5 hp without excessive heat buildup. Reed valves made from stainless steel maintain sealing integrity over long duty cycles. No decibel rating or power-consumption figure is supplied.

What the Bundled Flywheel Changes

The included 10 1/8 in flywheel bolts directly to the crankshaft, eliminating the need to source a matching pulley separately. Its single A-section groove aligns with standard V-belt drives used on 1 hp and 1.5 hp Rolair models. Because the pump rotates CCW, the flywheel orientation is fixed; swapping to a CW motor would require a different pump assembly.

Highlights

  • Direct-drive simplicity with a single-stage design
  • 5 hp maximum output for strong airflow
  • 66 or 3.72 cfm at 145 psi delivery
  • Durable aluminum and cast-iron construction
  • Stainless-steel reed valves resist wear

Specifications

BrandROLAIR

Questions about this item

How do I install the PMP11K8GR cylinder replacement pump and what step is often missed?

Mount the pump with the 10 1/8 in flywheel facing the motor, align the single A-section groove, and set rotation to CCW; the step most often missed is filling the crankcase with 12 fl oz of oil before the first start.

What maintenance will the PMP11K8GR need later and when?

Change the splash-lubrication oil after the initial break-in period and then at regular intervals; inspect the stainless-steel reed valves and the single cast-iron cylinder bore for wear whenever pressure drops below 145 psi.

What limit appears first during sustained operation of the PMP11K8GR?

The 145 psi maximum operating pressure is the first hard limit; at that pressure the pump delivers 2.66 cfm, and the 1.5 hp motor cannot sustain higher output without exceeding its rated speed of 1,000 RPM.

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